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Port Mapper - How does it work?

Hello- Can someone tell me generally how Port Mapper gets port information to me? What does the Switch provide, and what does the Router provide?

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greg

Hi Puanani - The switch (any layer 2 device) provides the switching information (mac->port->interface/VLAN) from the Bridge-MIBs and Port Tables and the router (or any layer 3 device) provides IP Addresses for the MAC's (ARP Table) found in those Bridge-MIBs.

Does that help?

--Greg

FormerMember

Thanks Greg for the quick reply. I have a better understanding now. But I know a certain switch has many physical servers plugged into it, but I only see mac addresses- no ipaddresses and no host names. Is it because Port Mapper has to go thru a firewall to get the the switch and router? I see no firewall drops though.

greg

It means the switch port mapper was not able to find any IP addresses for those MACs in the ARP table of the device specified to be the source for layer 3 info.

HTH,

Greg